Open AccessMetasurface‐loaded circularly‐polarised slot antenna with high front‐to‐back ratio
Author(s) -
Chung K.L.,
Kharkovsky S.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2013.1556
Subject(s) - axial ratio , optics , slot antenna , wideband , bandwidth (computing) , physics , horn antenna , broadside , wavelength , radiation pattern , materials science , antenna (radio) , circular polarization , electrical engineering , telecommunications , microstrip , engineering
A new technique to achieve high front‐to‐back radiation ratios of slot antennas is presented. A 0.8 mm thin metasurface is loaded onto a circularly‐polarised slot antenna and backed by a metallic reflector at close distances. The antenna has an overall height of ∼ 0.1 wavelengths. However, it exhibits wideband characteristics with a measured impedance bandwidth (voltage standing‐wave ratio ≤ 2) of 73.3% and a 3 dB axial‐ratio bandwidth of 29.1%. A broadside gain of 7 dBic with a front‐to‐back ratio of 23.7 dB is achieved at 2.7 GHz.